mirror of
https://github.com/fmtlib/fmt.git
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301 lines
9.4 KiB
C++
301 lines
9.4 KiB
C++
// Formatting library for C++ - std::ostream support tests
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//
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// Copyright (c) 2012 - present, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#define FMT_STRING_ALIAS 1
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#include "fmt/format.h"
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struct test {};
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// Test that there is no issues with specializations when fmt/ostream.h is
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// included after fmt/format.h.
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namespace fmt {
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template <> struct formatter<test> : formatter<int> {
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template <typename FormatContext>
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typename FormatContext::iterator format(const test&, FormatContext& ctx) {
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return formatter<int>::format(42, ctx);
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}
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};
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} // namespace fmt
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#include "fmt/ostream.h"
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#include <sstream>
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#include "gmock.h"
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#include "gtest-extra.h"
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#include "util.h"
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using fmt::format;
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using fmt::format_error;
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static std::ostream& operator<<(std::ostream& os, const Date& d) {
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os << d.year() << '-' << d.month() << '-' << d.day();
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return os;
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}
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static std::wostream& operator<<(std::wostream& os, const Date& d) {
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os << d.year() << L'-' << d.month() << L'-' << d.day();
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return os;
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}
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// Make sure that overloaded comma operators do no harm to is_streamable.
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struct type_with_comma_op {};
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template <typename T> void operator,(type_with_comma_op, const T&);
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template <typename T> type_with_comma_op operator<<(T&, const Date&);
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enum streamable_enum {};
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static std::ostream& operator<<(std::ostream& os, streamable_enum) {
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return os << "streamable_enum";
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}
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static std::wostream& operator<<(std::wostream& os, streamable_enum) {
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return os << L"streamable_enum";
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}
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enum unstreamable_enum {};
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TEST(OStreamTest, Enum) {
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EXPECT_EQ("streamable_enum", fmt::format("{}", streamable_enum()));
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EXPECT_EQ("0", fmt::format("{}", unstreamable_enum()));
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EXPECT_EQ(L"streamable_enum", fmt::format(L"{}", streamable_enum()));
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EXPECT_EQ(L"0", fmt::format(L"{}", unstreamable_enum()));
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}
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using range = fmt::buffer_range<char>;
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struct test_arg_formatter : fmt::arg_formatter<range> {
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fmt::format_parse_context parse_ctx;
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test_arg_formatter(fmt::format_context& ctx, fmt::format_specs& s)
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: fmt::arg_formatter<range>(ctx, &parse_ctx, &s), parse_ctx("") {}
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};
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TEST(OStreamTest, CustomArg) {
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fmt::memory_buffer buffer;
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fmt::internal::buffer<char>& base = buffer;
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fmt::format_context ctx(std::back_inserter(base), fmt::format_args());
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fmt::format_specs spec;
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test_arg_formatter af(ctx, spec);
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fmt::visit_format_arg(
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af, fmt::internal::make_arg<fmt::format_context>(streamable_enum()));
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EXPECT_EQ("streamable_enum", std::string(buffer.data(), buffer.size()));
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}
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TEST(OStreamTest, Format) {
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EXPECT_EQ("a string", format("{0}", TestString("a string")));
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std::string s = format("The date is {0}", Date(2012, 12, 9));
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EXPECT_EQ("The date is 2012-12-9", s);
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Date date(2012, 12, 9);
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EXPECT_EQ(L"The date is 2012-12-9",
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format(L"The date is {0}", Date(2012, 12, 9)));
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}
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TEST(OStreamTest, FormatSpecs) {
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EXPECT_EQ("def ", format("{0:<5}", TestString("def")));
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EXPECT_EQ(" def", format("{0:>5}", TestString("def")));
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#if FMT_NUMERIC_ALIGN
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EXPECT_THROW_MSG(format("{0:=5}", TestString("def")), format_error,
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"format specifier requires numeric argument");
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#endif
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EXPECT_EQ(" def ", format("{0:^5}", TestString("def")));
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EXPECT_EQ("def**", format("{0:*<5}", TestString("def")));
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EXPECT_THROW_MSG(format("{0:+}", TestString()), format_error,
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"format specifier requires numeric argument");
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EXPECT_THROW_MSG(format("{0:-}", TestString()), format_error,
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"format specifier requires numeric argument");
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EXPECT_THROW_MSG(format("{0: }", TestString()), format_error,
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"format specifier requires numeric argument");
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EXPECT_THROW_MSG(format("{0:#}", TestString()), format_error,
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"format specifier requires numeric argument");
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EXPECT_THROW_MSG(format("{0:05}", TestString()), format_error,
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"format specifier requires numeric argument");
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EXPECT_EQ("test ", format("{0:13}", TestString("test")));
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EXPECT_EQ("test ", format("{0:{1}}", TestString("test"), 13));
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EXPECT_EQ("te", format("{0:.2}", TestString("test")));
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EXPECT_EQ("te", format("{0:.{1}}", TestString("test"), 2));
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}
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struct EmptyTest {};
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static std::ostream& operator<<(std::ostream& os, EmptyTest) {
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return os << "";
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}
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TEST(OStreamTest, EmptyCustomOutput) {
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EXPECT_EQ("", fmt::format("{}", EmptyTest()));
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}
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TEST(OStreamTest, Print) {
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std::ostringstream os;
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fmt::print(os, "Don't {}!", "panic");
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EXPECT_EQ("Don't panic!", os.str());
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std::wostringstream wos;
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fmt::print(wos, L"Don't {}!", L"panic");
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EXPECT_EQ(L"Don't panic!", wos.str());
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}
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TEST(OStreamTest, WriteToOStream) {
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std::ostringstream os;
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fmt::memory_buffer buffer;
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const char* foo = "foo";
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buffer.append(foo, foo + std::strlen(foo));
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fmt::internal::write(os, buffer);
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EXPECT_EQ("foo", os.str());
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}
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TEST(OStreamTest, WriteToOStreamMaxSize) {
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std::size_t max_size = fmt::internal::max_value<std::size_t>();
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std::streamsize max_streamsize = fmt::internal::max_value<std::streamsize>();
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if (max_size <= fmt::internal::to_unsigned(max_streamsize)) return;
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struct test_buffer : fmt::internal::buffer<char> {
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explicit test_buffer(std::size_t size) { resize(size); }
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void grow(std::size_t) {}
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} buffer(max_size);
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struct mock_streambuf : std::streambuf {
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MOCK_METHOD2(xsputn, std::streamsize(const void* s, std::streamsize n));
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std::streamsize xsputn(const char* s, std::streamsize n) {
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const void* v = s;
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return xsputn(v, n);
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}
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} streambuf;
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struct test_ostream : std::ostream {
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explicit test_ostream(mock_streambuf& buffer) : std::ostream(&buffer) {}
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} os(streambuf);
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testing::InSequence sequence;
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const char* data = nullptr;
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typedef std::make_unsigned<std::streamsize>::type ustreamsize;
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ustreamsize size = max_size;
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do {
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auto n = std::min(size, fmt::internal::to_unsigned(max_streamsize));
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EXPECT_CALL(streambuf, xsputn(data, static_cast<std::streamsize>(n)))
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.WillOnce(testing::Return(max_streamsize));
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data += n;
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size -= n;
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} while (size != 0);
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fmt::internal::write(os, buffer);
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}
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TEST(OStreamTest, Join) {
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int v[3] = {1, 2, 3};
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EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join(v, v + 3, ", ")));
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}
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#if FMT_USE_CONSTEXPR
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TEST(OStreamTest, ConstexprString) {
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EXPECT_EQ("42", format(FMT_STRING("{}"), std::string("42")));
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EXPECT_EQ("a string", format(FMT_STRING("{0}"), TestString("a string")));
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}
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#endif
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namespace fmt_test {
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struct ABC {};
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template <typename Output> Output& operator<<(Output& out, ABC) {
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out << "ABC";
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return out;
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}
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} // namespace fmt_test
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template <typename T> struct TestTemplate {};
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template <typename T>
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std::ostream& operator<<(std::ostream& os, TestTemplate<T>) {
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return os << 1;
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}
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namespace fmt {
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template <typename T> struct formatter<TestTemplate<T>> : formatter<int> {
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template <typename FormatContext>
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typename FormatContext::iterator format(TestTemplate<T>, FormatContext& ctx) {
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return formatter<int>::format(2, ctx);
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}
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};
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} // namespace fmt
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#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 407
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TEST(OStreamTest, Template) {
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EXPECT_EQ("2", fmt::format("{}", TestTemplate<int>()));
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}
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TEST(FormatTest, FormatToN) {
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char buffer[4];
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buffer[3] = 'x';
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auto result = fmt::format_to_n(buffer, 3, "{}", fmt_test::ABC());
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EXPECT_EQ(3u, result.size);
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EXPECT_EQ(buffer + 3, result.out);
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EXPECT_EQ("ABCx", fmt::string_view(buffer, 4));
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result = fmt::format_to_n(buffer, 3, "x{}y", fmt_test::ABC());
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EXPECT_EQ(5u, result.size);
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EXPECT_EQ(buffer + 3, result.out);
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EXPECT_EQ("xABx", fmt::string_view(buffer, 4));
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}
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#endif
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#if FMT_USE_USER_DEFINED_LITERALS
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TEST(FormatTest, UDL) {
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using namespace fmt::literals;
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EXPECT_EQ("{}"_format("test"), "test");
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}
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#endif
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template <typename T> struct convertible {
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T value;
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explicit convertible(const T& val) : value(val) {}
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operator T() const { return value; }
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};
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TEST(OStreamTest, DisableBuiltinOStreamOperators) {
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EXPECT_EQ("42", fmt::format("{:d}", convertible<unsigned short>(42)));
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EXPECT_EQ(L"42", fmt::format(L"{:d}", convertible<unsigned short>(42)));
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EXPECT_EQ("foo", fmt::format("{}", convertible<const char*>("foo")));
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}
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struct explicitly_convertible_to_string_like {
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template <typename String,
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typename = typename std::enable_if<std::is_constructible<
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String, const char*, std::size_t>::value>::type>
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explicit operator String() const {
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return String("foo", 3u);
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}
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};
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TEST(FormatterTest, FormatExplicitlyConvertibleToStringLike) {
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EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
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}
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std::ostream& operator<<(std::ostream& os,
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explicitly_convertible_to_string_like) {
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return os << "bar";
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}
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TEST(FormatterTest, FormatExplicitlyConvertibleToStringLikeIgnoreInserter) {
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EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
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}
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#ifdef FMT_USE_STRING_VIEW
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struct explicitly_convertible_to_std_string_view {
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explicit operator fmt::internal::std_string_view<char>() const {
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return {"foo", 3u};
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}
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};
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TEST(FormatterTest, FormatExplicitlyConvertibleToStdStringView) {
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EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
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}
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std::ostream& operator<<(std::ostream& os,
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explicitly_convertible_to_std_string_view) {
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return os << "bar";
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}
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TEST(FormatterTest, FormatExplicitlyConvertibleToStdStringViewIgnoreInserter) {
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EXPECT_EQ("foo",
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fmt::format("{}", explicitly_convertible_to_std_string_view()));
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}
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#endif // FMT_USE_STRING_VIEW
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